Tension for loom shuttles



Dec. 27, 1938. &

R. G. TURNER TENSION FOR LOOM SHUTTLES Filed Feb. 15, 1957 Inventor Rickar G. Turner 11 ffl Elm/d: Attorney Patented Dec. 27, 1938 UNITED STATES PATENT oFFieE 2,141,675 TENSION FOR LOOM SHUTTLES Application February 15, 1937, Serial No. 125,763

5 Claims.

This invention relates to improvements in shuttle tensions and it is the principal object of the invention to'construct the tension so that the over-all length of the shuttle can be reduced.

In certain types of shuttles, such as those used in the weaving of silk, it has been customary to use a pivoted wire having several eyes to cooperate with fixed pins for the purpose of giving the weft a sinuous course as it passes through the shuttle eye. As heretofore constructed, however, the bobbin and-Weft tension compartments have been separated by a partition to support a porcelain eye through which the weft passes. This partition has increased the length of the shuttle and it is an object of my invention to eliminate the partition by mounting the eye directly on the pivoted wire of the tension.

When the weft of a bobbin is almost exhausted it wraps around the bobbin and is likely to stick to the bobbin. With the guide eyes stationary with respect to the shuttle as heretofore construoted there has been little opportunity for the thread to free itself under these conditions. And it is another object of my present invention to make the guide eye movable in response to an increased tension of the weft. In this way the condition which tightens the weft and threatens breakage is caused to move the eye and therefore the thread laterally with respect to the shuttle to assist in dislodging it from the bobbin which is holding it.

When threading shuttle tensions of the general type shown it has heretofore been necessary to move the loops in the pivoted wire to an alonormal position beyond the pins and cause the threading needle to pass not only through the loops but also the fixed eye. It is another object of my present invention to facilitate the threading of the eye by mounting the latter on the wire so that it swings with the loops and always sustains a threading relation with respect to the latter.

It is a further object of my invention to distribute wearing of the pins in the shuttle tension by causing the looped wire to swing in a plane oblique with respect to the pins, thereby causing a sliding of the thread along the pins to avoid wearing at one point.

With these and other objects in view-which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawing, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a top plan view of a shuttle made according to the preferred form of my present invention with the tension held by a taut weft thread,

Fig. 2 is a view similar to Fig. 1 but showing the thread tension in intermediate position in full lines and in relaxed position in dotted lines,

Fig. 3 is a front elevation of part of a shuttle having the modified support for the looped wire used for distributing the wear of the wire along the pins, and

Fig. 4 is a vertical section on line 4- 3, Fig. 3.

Referring particularly to Figs. 1 and 2, Where the preferred form of the invention is shown, the lay in has a shuttle box Bwith a back I l, binder I2, binder spring I3 and picker M. A shuttle S has a spindle l5 and a bobbin or quill It on which is mounted the weft W. The quill may be held by a clip I! secured to the shuttle.

.My present improvements relate to the tension in the shuttle eye and in carrying my invention into effect I provide a wire 2i! having several coils to define a bearing 2| surrounding a vertical pivot pin 22 fixed in the front part of the shuttle. The wire extends rearwardly as at23 and has secured thereto a shuttle eye 24 which may be of porcelain, glass or the like having a bore through which the weft extends. The wire then extends toward the adjacent tip end of the shuttle as at 26 and is provided with a series of loops 2? which lie intermediate a line of fixed pins 28 spaced to accommodate the loops. The end of the wire may be turned back on itself as at 29 to form an eye for an elastic 39 connected as at 3! to the shuttle, and the tip of the wire may be extended as at"32 to form a stop to engage a limiting pin 33 fixed to the shuttle. The effect of the elastic 30 is to hold the wire in the dotted line position shown in Fig. 2 with the loops or eyes 21 spaced a maximum distance from the pins 28.

The thread passes as indicated in Fig. 1 from the quill or bobbin through the eye 24 and around. the pins 28 and through the loops 2?, so that the thread follows a zigzag path. When leaving the last or outermost loop 21 it passes between a pair of eye or guiding posts 35 and extends either to the left as at 36 or to the right along the front wall 31 of the shuttle.

In operation, I prefer to have the eye 24 aligned with the axis of the bobbin when the tension is at some intermediate point, such as half way between its extreme positions, as indicated in .full lines in Fig. 2. When the shuttle is in flight the wire 20 vibrates due to the varying tension of the weft thread and when the shuttle is boxed the elastic 39 will pull the wire until the slack in the weft is absorbed, or until the extreme end 32 engages the stop pin 33. The eye 25, being movable, assists in the taking up action of the weft.

Should the wrap of weft around the bobbin barrel increase the thread tension when the weft is almost exhausted,.the tightening of the thread will cause a swinging of the wire with resultant lateral movement of the eye 2'3 and the path of the thread is therefore changed'with likelihood that the sticking thread will be dislodged from the barrel of the bobbin.

' It is found that the pins 28 have a tendency to wear at definite points along their front surfaces due to the fact that the weft is drawn over the pins at these points. As shown in the preferred form of the invention and as also employed in shuttle tensions of this general type as heretofore constructed the looped wire swings about a vertical axis which requires the loops to 'move or swing in a plane perpendicular to the pins 28, and because of this condition the thread engages the same part of the pins for all positions of the swinging wire.

In carrying the modification of my invention into effect I swing the looped wire in a plane oblique with respect to the guide pins. As shown in Fig. 4, the pivot pin 68 for the wire al, which may be similar to wire 20 of the preferred form, is inclined upwardly and forwardly, while the pins 28 are vertical, as is usual. When the tension is at a maximum and the loops 42 are near the pins 28, the loops are in a relatively low position to place the thread along the lower part of the pins 23, asindicated in dotted lines; Fig. 3. the elastic moves the wire it rearwardly away from the pins 28, the wire moves upwardlyas well as rearwardly as shown in full lines, Fig. 3,

and therefore changes the points of contact between the weft and pins 28. The distribution of wear is also present in the case of the guide posts 35, the latter serving partly as tension pins in that one or the other of them'always coope crates with the looped wire to hold the weft taut.

While I haveshown means for distributing the wear of the pins 23 by causing the looped wire to rise as it swings away from the pins, yet I do not wish to be limited to this particular ar-.

rangement, as the result will be accomplished if the wire swings in a plane oblique with respect to the pins 23. r

From the foregoing it will be seen that; I have provided a shuttle tension wherein the eye which the thread enters when leaving the bobbin is mounted for lateral movement relatively to the shuttle. It will further be seen that this eye is carried by the wire which is provided with the loops 2? and therefore always sustains a definite relationship with respect to said loops to the end that threading of the eye may be facilitated. It will also be seen that the movable eye 26 makes provision for dislodging the thread should the When the tension slackens, however, and

latter become wrapped around the bobbin barrel, and that the movement is induced by the increasing tension of the weft thread which results from the thread being held. It will further be seen that the shuttle can be made shorter than has been possible heretofore for a given bobbin length due to the fact that the eye' is mounted directly'on the tension wire and the partition between the tension and bobbin compartments heretofore employed has been eliminated. As a matter of practical shuttle manufacture it will also be seen thatthe wire and tension'parts together with the eye 26 lie in a slot extending transversely through the shuttle and having substantially straight sides so that a single cutting operation through the end of the shuttle suffices to provide room for the thread tension. It will further be seen that I have made provision for distributing wear caused by the weft on the pins 28 and guide posts 35 by causing the looped wire to move in a plane oblique with respect to these parts. 7

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and- I do not wish-to be limited to the details herein disclosed, but what I claim is:

i. In a weft shuttle, a tension pin fixed in the shuttle, a thread loop on each side of the pin, and a pivot for the thread loops inclined with respect to the tension pin to cause the loops to 'move away from the pin in a direction oblique to the pin.

2. In a loom shuttle having a weft supply, a plurality of spaced tension pins, a tensioning member movable in a plane transverse of the pin and having loops to receive the weft, and a pivot for the tension member inclined with respect to the tension pins to cause the plane in which the tension wire moves to be oblique with respect to the pins.

3. In a shuttle having a weft supply, a tension wire having a plurality of spaced thread loops through which the thread extends, a plurality ofs'paced pins intermediate the loops, and

.a pivot for the wire, the angular relationship between the pivot and'the'pins being oblique to cause the weft to slide vertically along the pins as the wire swings about the pivot thereof.

. i. In a shuttle having a supply of weft thread,

a plurality of spaced vertical tension pins, a

wire having thread loops which lie intermediate the pins, and means defining" a pivot for the wire which is inclined with respect to the pins to cause said wire to have a motion witha vertical component when swinging about the pivot thereof.

5. Ina weft shuttle, a weft guide post fixed to the shuttle, a thread loop through which weft passes, and a pivot for the thread loop inclined with respect to the guide post to cause the loop to move toward and away fromthe post in a direction oblique to the post.

RICHARD GJTURNER. 

